public class MainActivity extends AppCompatActivity {
private Button button;
    private EditText editText1;
    private EditText editText2;
    private CheckBox checkBox;
    private Button bu;
    SharedPreferences pref;
    SharedPreferences.Editor editor;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button= (Button) findViewById(R.id.button);
        editText1= (EditText) findViewById(R.id.editText);
        editText2= (EditText) findViewById(R.id.editText2);
        checkBox= (CheckBox) findViewById(R.id.checkBox);
        bu= (Button) findViewById(R.id.button);
        pref=getSharedPreferences("mypref",MODE_PRIVATE);
        editor=pref.edit();
        String con=pref.getString("username","");
        if (con==null){
            checkBox.setChecked(false);
        }
        else {checkBox.setChecked(true);}
        bu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String user1=editText2.getText().toString().trim();
                String user=editText1.getText().toString().trim();
                if ("admin".equals(user)&&"1234567".equals(user1)){
                    if (checkBox.isChecked()){
                        editor.putString("username",user1);
                        editor.putString("password",user);
                        editor.commit();
                    }
                    //Toast.makeText(MainActivity.this,"登陆成功",Toast.LENGTH_LONG);
                    else {
                        editor.remove("username");
                        editor.remove("password");
                        editor.commit();
                    }
                    Toast.makeText(MainActivity.this,"登陆成功",Toast.LENGTH_LONG).show();
                }
                else {
                    Toast.makeText(MainActivity.this,"密码错误",Toast.LENGTH_SHORT);
                }
            }
        });
    }

    }